Data on diffusion in 3N85-purity Ni, and in alloys prepared from this Ni and 3N8-purity Fe, were reported. The results (table 123) showed that, in every case, a break in the Arrhenius plot occurred at the Curie temperature. This was explained in terms of diffusion theories, for interstitial atoms, which took account of exchange interactions.

N.I.Barmin, P.V.Geld, V.P.Levchenko, S.I.Masharov, R.A.Ryabov, N.I.Shvetsov: Doklady Akademii Nauk, 1974, 215[3], 567-9

 

 

 

Table 123

Effect of Magnetic Ordering upon H Diffusion in Ni-Fe at 250 to 850C

 

Fe (%)

Tc (C)

Condition

Do (cm2/s)

E (kcal/g-atom)

0

630

ferromagnetic

9.0 x 10-4

7.1

0

630

paramagnetic

5.2 x 10-3

9.5

50

790

ferromagnetic

2.1 x 10-3

8.2

50

790

paramagnetic

9.7 x 10-3

11.2

40

840

ferromagnetic

2.2 x 10-3

8.8

40

840

paramagnetic

2.1 x 10-2

12.1